Discovering the conversation

The nature of the conversation : starting with C

Expanding the alphabet : N and P

Completing life's alphabet : S and trace elements

Water and oxygen

Trimming the tree of life

Living on a dynamic planet

The conversation begins

The story of O, part 1

The story of O, part 2

The story of O, part 3

The minerals of life

Plants enter the conversation

Climate and habitability

Close calls?

The conversation in the twenty-first century

Other conversations? Mars

Other conversations? Everywhere else.